https://findsmi.ru/firebase-messaging-sw.js

1importScripts('https://www.gstatic.com/firebasejs/3.7.2/firebase-app.js');
2importScripts('https://www.gstatic.com/firebasejs/3.7.2/firebase-messaging.js');
3
4firebase.initializeApp({
5  messagingSenderId: "934654383868",
6});
7
8const messaging = firebase.messaging();
9
10// Customize notification handler
11messaging.setBackgroundMessageHandler(function(payload) {
12  console.log('Handling background message', payload);
13
14  // Copy data object to get parameters in the click handler
15  payload.data.data = JSON.parse(JSON.stringify(payload.data));
16
17  return self.registration.showNotification(payload.data.title, payload.data);
18});
19
20self.addEventListener('notificationclick', function(event) {
21  const target = event.notification.data.click_action || '/';
22  event.notification.close();
23
24  // This looks to see if the current is already open and focuses if it is
25  event.waitUntil(clients.matchAll({
26    type: 'window',
27    includeUncontrolled: true
28  }).then(function(clientList) {
29    // clientList always is empty?!
30    for (var i = 0; i < clientList.length; i++) {
31      var client = clientList[i];
32      if (client.url === target && 'focus' in client) {
33        return client.focus();
34      }
35    }
36
37    return clients.openWindow(target);
38  }));
39});